Supplemental Disclosures to the Consolidated Statements of Cash Flows

6 Months Ended

Jun. 30, 2012

Supplemental Cash Flow Elements [Abstract]

Supplemental disclosures to the consolidated statements of cash flows

Supplemental disclosures to the consolidated statements of cash flows

Supplemental disclosures to the consolidated statements of cash flows are presented below:

	Six months ended June 30,
	2012			2011
Net cash provided by operating activities included:
Cash payments for interest	$	54,306		$	38,372
Interest capitalized	(1,927		)	(1,195		)
Cash payments for interest, net of amounts capitalized	$	52,379		$	37,177
Cash (receipts) payments for income taxes	$	155		$	—
Non-cash investing activities included:
Asset retirement costs capitalized	$	416		$	242
Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities	$	39,418		$	(4,920	)